gday how are you finding runtime with the 9901 ?? wonder what the 9853 with 41001 header would go like??

I can vouch for Ron on this one. His motor is pretty fresh and only has 1 race weekend on it thus far, but has a lot of practice on it.

We haven't done timed runs and the first final he ran, we didn't attempt long pit stops. He was pitting around 8 minutes and it was only taking around 90cc of fuel in a truggy. That leaves about 60cc left in the tank so he can easily go beyond the 10 minute mark.

We'll know more after this weekend's ROAR event at LCRC raceway.

I can not tell you how that header pipe combo would work cause I've never tried a 9853 pipe. I can tell you the 41001 header gave me more bottom but it was not as smooth. I may run the 41001/2096 pipe combo on my keepoff 4 in buggy depending on if the 41021/2096 combo doesn't give me the bottom I'm looking for.

As for runtime like Schreff said my engine is still fairly fresh and it already seems like it will be a 10+ engine with the 9901/41021 combo w/ an EB Mods fuel cooler.

Looking at the plus 4 tuned, 21-4 btta tuned, and plus 21-4c. This is for an mbx7. Do any of these have a filled crank? How does the power and fuel economy compare between the 3? Which would be best in a buggy?

No off-road engines under the Nova label come with filled cranks.

They all run virtually the same and get virtually the same mileage.

The btta has faintly less torque and a touch more top end than the older 4c due to exhaust timing.

Any will be perfectly at home on any buggy.

Hi,

This is not completely true, the T-Plus 5 (Novarossi TOP engines) have filled crank, on the other hand they are not so commonly available as Novarossi other engines.
See http://www.novarossi.it/2012/index.p.../t-plus-5.html

anyone know where I can get my hands on a piston (only) for a p5???

Piston only is not available from any engine company as pistons are matched to sleeves. You will have to buy a piston/sleeve set.

Hi Everyone, what is the best way to make a break in to a novarossi p5?

Follow Novarossi instructions in the paperwork they send with them. You will need some break in fuel made up though.

The sticky at the top of this page.."The Breakin Bible" should be more than enough advice and help...

Good Luck...

Hey guys, As my P5 XLT get more and more mileage on it, Im starting to think about new engines. I love my P5, it's such an awesome engine!

As far as decisions go, Im debating between the Mugen B5 and the B4.

It's for an MBX7, BTW with the Losi RE12 system (similar to 9901, 021 combo). how does the B4 compare to the B5 (same as P5) as far as performance and mileage?

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I would stick with the p5 if your looking for something more then maybe look at the crank modded/silicone filled or even a complete mod some reputable guys on here well worth talking too

as one of the guys said see the break in bible but most importanly heat cycle your engine run in time anywhere between 1.5-2 gals (6-8 ltrs) I am currently running in my p5 on my hudy break in bench all going well nice engine

My p5 is toast after only 2 gallons compression is nil and the front bearing leaks very bad. When the piston and sleeve were pulled I found scratches on the back side of the piston and sleeve directly on the exhaust port. I have been very meticulous about air filter maintenance and have never even seen a speck of dust or dirt on the secondary filter. Any ideas on the cause it was not a glow plug element changed the first one after break in and im on my third one now. I'm hopping a polish and a pinch will get me back up and running with a new front bearing. Any help would be appreciated. Oh I run a Mugen MBX6. thanks